h-entry-getitems

#!/bin/sh
PLANE_TEXT_SEP=">"

strip_tags() {
    # <tag1>value1</tag1><tag2>value2</tag2><tag3>value3</tag3>
    # value1,value2,value3
    sed -e "s/<entry>//" -e "s/<\/entry>//" \
        | sed "s#<[^>]*>\([^<]*\)</[^>]*>#\1${PLANE_TEXT_SEP}#g" \
        | sed "s/>$//"
}

if [ $# -eq 0 ]; then
    strip_tags
else
    pick_tags=
    for tag in "$@"; do
        # ,<tag1>,<tag2>....
        pick_tags="$pick_tags,<$tag>"
    done
    # ,<tag1>,<tag2>
    # <tag1>,<tag2>
    pick_tags=${pick_tags#,}
    awk -v target="$pick_tags" -v target_num=$# \
    'BEGIN { \
        split(target, tags, ",");
        for (i=1; i<=target_num; i++) {
            len[i]=length(tags[i])
            tags[i]=tags[i] "[^<]*";
        }
    }{
        fields=""
        for (i=1; i<=target_num; i++) {
            where=match($0, tags[i]);
            if (where == 0) {
                fields=fields "'$PLANE_TEXT_SEP'"
            }else {
                fields=fields "'$PLANE_TEXT_SEP'" substr($0, RSTART+len[i], RLENGTH-len[i]);
            }
        }
        sub(/^'"$PLANE_TEXT_SEP"'/, "", fields)
        print fields
    }'
fi